Difference: SiaInterface (11 vs. 12)

Collaborative Page for SIA Interface

The Simple Image Access (SIA) interface defines a protocol for retrieving image data from a variety of astronomical image repositories through a uniform interface. The interface is meant to be reasonably simple to implement by service providers. A query typically defining a rectangular region on the sky is used to query for candidate images. The service returns a list of candidate images formatted as a VOTable. For each candidate image an access reference URL may be used to retrieve the image. Images may be returned in a variety of formats including FITS and various graphics formats. Referenced images are often computed on the fly, e.g., as cutouts from larger images.

SIAV2 Working Drafts and Recent Papers

• Interferometry (radio) data and the required SIAV2 capabilities (A.Richards, February 2010).

• Simple Image Access V2.0 (SIAV2 draft as of fall 2009)

• Simple Image Access V1.0 (Legacy SIA V1.0 specification)

Since late 2009 SIA V1.0 is now an IVOA Recommendation.

A major update to the SIA interface, SIA V2.0, is in the planning stages. A partial working draft is available at the link above, as well as related analysis papers as noted on this page.

SIA Related IVOA Notes

• SIAV2-Analysis.pdf (Scope and Concepts of SIAV2)
• DAL2_Architecture.pdf (DAL2 Service Architecture and Standard Profile)
• Polarization.pdf (Note on polarization, primarily referring to radio data)